Defined Values

The HUAWEI-MPLSOAM-MIB contains objects to configure OAM module.
The Operation, Administration and Maintenance (OAM)
is an effective means for decreasing the cost of network maintenance.
The MPLS OAM is used to administrate and maintain MPLS.

There are two types of OAM packets, CV and FFD.
The CV flow is generated at the source LSR of the LSP with
a nominal frequency of 1/s and terminated at the sink LSR of the LSP.
FFD provides failure detection option for an LSP independent
of the CV based availability model and is not tied to the
CV insertion rate. Insertion rates at 1/s or faster may
also be used.
The CV/FFD packet contains a network-unique identifier (TTSI)
so that all types of defects can be detected.
1: CV;
2: FFD.

For CV: the frequency is static, per second.
For FFD: the frequency is set by user. The value
can be 10ms, 20ms, 50ms,100ms,200ms,500ms,3ms.
Any other frequency is wrong.
0: 1000ms(only for cv);
1: 10ms;
2: 20ms;
3: 50ms;
4: 100ms;
5: 200ms;
6: 500ms;
7: 3ms.

When an LSP is found to be in defect, the sink LSR if the LSP
should send BDI to inform the source LSR of the LSP, the BDI is
transferred through the reverse LSP.
The type of reverse LSP can be private or shared.
If private, then the reverse LSP can be used only when the only
LSP is in defect;
If shared, the reverse LSP which is shared between many forward
LSPs, whose source LSRs are the same and sink LSRs are the same.
1: private;
2: share.

Whether one LSP is OAM enable.
If disable, LSP is not monitored;
If enable, CV/FFD is generated at the source LSR of the LSP and
checked at the sink LSR of the LSP,and user can set
other configuration.
0: The OAM function is disabled on the ingress;
1: The OAM function is enabled on the ingress.

If the LSP Timer (T1) expires, then the LSP enters the
Unavailable state. The start point of the Unavailable state
is deemed to be at the entry into the LSP defect state.
An LSP re-enters the Available state after the LSP Defect state
exists first.
T1 defines the length of time the LSP is in the Defect state
before declaring an LSP Unavailable or returning to defect
free state.
0: available state;
1: unavailable state.

BDI is generated at the trail termination source point of
a return path in response to a defect detected at the trail
termination sink point of an LSP in the forwarding direction.
The frequency of BDI can be set by user.
1: perSecond;
2: same as detect frequency.

When an LSP is found to be in defect, the sink LSR of the LSP
should send BDI to inform the source LSR of the LSP,the BDI is
transferred through the reverse LSP.
The type of reverse LSP can be private or shared.
If private, then the reverse LSP can be used only when the only
LSP in defect;
If shared, the reverse LSP, which is shared between many forward
LSPs that have the same source LSRs and sink LSRs.
0: invalid, when the reverse LSR does not exist;
1: private;
2: share.

This time is set at the egress.
If the egress receives CV/FFD, it records the parameters
included in the packet, such as OAM type and frequency.
If the egress does not receive any OAM packet before the timer
expires, the sink LSR will send BDI with dLOCV defect.
Valid only for the egress configuration.

BDI is generated at the trail termination source point of
a return path in response to a defect detected at the trail
termination sink point of an LSP in the forwarding direction.
The frequency of BDI can be set by user.
Only valid for egress configuration.
The default value is detect frequency and it is valid only when a
backward-LSP exists.
0: perSecond;
1: same as detect frequency.

Whether one LSP is enabled with OAM.
If disable, LSP is not monitored;
If enable, CV/FFD is generated at the source LSR of the LSP and
checked at the sink LSR of the LSP, and user can set
other configuration.
0: The OAM function is disabled on the egress;
1: The OAM function is enabled on the egress.

If the LSP Timer (T1) expires, then the LSP enters the
Unavailable state. The start point of the Unavailable state
is deemed to be at the entry into the LSP defect state.
An LSP re-enters the Available state after the LSP Defect State.
first exists.
T1 defines the length of time the LSP is in the Defect state
before declaring an LSP Unavailable or returning to defect
free state
0: available state;
1: unavailable state.

For CV: the frequency is static, per second.
For FFD: the frequency is set by user. The value
can be 10ms, 20ms, 50ms,100ms,200ms,500ms,3ms.
Any other frequency is wrong.
0: 1000ms(only for cv);
1: 10ms;
2: 20ms;
3: 50ms;
4: 100ms;
5: 200ms;
6: 500ms;
7: 3ms.

For CV: the frequency is static, per second.
For FFD: the frequency is set by user. The value
can be 10ms, 20ms, 50ms,100ms,200ms,500ms,3ms.
Any other frequency is wrong.
0: 1000ms(only for cv);
1: 10ms;
2: 20ms;
3: 50ms;
4: 100ms;
5: 200ms;
6: 500ms;
7: invalid;
8: 3ms.

If the oam receives CV/FFD, it records the parameters
included in the packet, such as OAM type and frequency.
If the oam does not receive any CV/FFD packet before the timer
expires, It will send BDI with dLOCV defect.

BDI is generated at the trail termination source point of
a return path in response to a defect detected at the trail
termination sink point of an LSP in the forwarding direction.
The frequency of BDI can be set by user.
1: perSecond;
2: same as detect frequency.

For CV: the frequency is static, per second.
For FFD: the frequency is set by user. The value
can be 10ms, 20ms, 50ms,100ms,200ms,500ms,3ms.
Any other frequency is wrong.
0: 1000ms(only for cv);
1: 10ms;
2: 20ms;
3: 50ms;
4: 100ms;
5: 200ms;
6: 500ms;
7: 3ms.

For CV: the frequency is static, per second.
For FFD: the frequency is set by user. The value
can be 10ms, 20ms, 50ms,100ms,200ms,500ms,3ms.
Any other frequency is wrong.
0: 1000ms(only for cv);
1: 10ms;
2: 20ms;
3: 50ms;
4: 100ms;
5: 200ms;
6: 500ms;
7: invalid;
8: 3ms.

If the oam receives CV/FFD, it records the parameters
included in the packet, such as OAM type and frequency.
If the oam does not receive any CV/FFD packet before the timer
expires, It will send BDI with dLOCV defect.

BDI is generated at the trail termination source point of
a return path in response to a defect detected at the trail
termination sink point of an LSP in the forwarding direction.
The frequency of BDI can be set by user.
1: perSecond;
2: same as detect frequency.

The FDI packet is used by the upstream node in an LSP
to inform the egress of the defect information.
It is also generated when the auto protocol is enabled,
with which the LSP ingress notifies the egress to stop
the OAM detection.

The type of protection switch,can be 1:1,1+1,shared mesh,
packet 1+1,the default choice is 1:1.
In the 1+1 architecture type, a protection LSP is dedicated to
each working LSP with the working LSP bridged onto the
protection LSP at the source of the protection domain.
The traffic on working and protection LSPs is transmitted
simultaneously to the sink of the protection domain,
where a selection between the working and protection LSP is
made, based on some predetermined criteria, such as defect
indication.
In the 1:1 architecture type, a protection LSP is dedicated to
each working LSP. The working traffic is transmitted either by
working or protection LSP.
In the shared mesh architecture type, possible sharing of
protection capacity between disjoint link, node in the network
is achieved while guaranteeing recovery from a single failure.
In the packet 1+1 architecture type, the traffic is transmitted
simultaneously onto two possibly disjoint routed LSPs to the
sink of the protection domain. Each pair of duplicate
transmitted packets is assigned the same identifier (sequence
number) but distinct from the other pairs of duplicate packets.
At the sink of the protection domain packet level selection
mechanism is employed to select one of the two possibly
received copies of each packet.
1: 1:1 protection switching,;
2: 1+1 protection switching;
3: shared mesh protection swiching;
4: packet 1+1 protection switching.

Revertive mode is a protection switching mode where revertive
action (switch back to the working LSP) is taken after the
working LSP is repaired.And switching does not occur in a
non-revertive mode.
1: revertive;
2: non-revertive;

Wait to Restore timer is only applicable for the revertive mode
and applies to a working LSP,It prevents reversion back to
select the working LSP until the Wait to Restore timer has
expired.The default value is 12 minutes.step is 30s.

The current switch condition of the protection group.
1: clear,This command clears all of the externally
initiated switch commands listed below;
2: lockout of protection,Fix the selector position on the
working LSP,Prevents the selector from switching to the
protection LSP when it is selecting the working LSP.
Switches the selector from the protection to the working LSP
when it is selecting the protection LSP;
3: forced protection,Switches the selector from the working LSP
to the protection LSP (unless a higher priority switch
request (i.e., LoP) is in effect);
4: signal fail,for 1:1,Signal Fail (SF) is declared when the
source of the protection domain enters the Defect State by
receiving a BDI packet (from the return LSP or out of band).
5: manual switch for working-lsp,Switches the selector from the
working LSP to the protection LSP (unless an equal or higher
priority switch request (i.e., LoP, FS, SF or MS) is in
effect);
6: manual switch for protection-lsp,Switches the selector from
the protection LSP to the working LSP (unless an equal or
higher priority switch request (i.e., LoP, FS, SF or MS) is
in effect).
7: WTR-timer;
8: HoldOff-timer;
9: Others;
The pripority of the commands are:
clear > lockout of protection > force switch > manual switch for working
lsp = manual switch for protection lsp

Revertive mode is a protection switching mode where revertive
action (switch back to the working LSP) is taken after the
working LSP is repaired.And switching does not occur in a
non-revertive mode.
1: revertive;
2: non-revertive;

Wait to Restore timer is only applicable for the revertive mode
and applies to a working LSP,It prevents reversion back to
select the working LSP until the Wait to Restore timer has
expired.The default value is 12 minutes.step is 30s.

Indicates the alarm reason as below:
1. Bridge type mismatch, one side is 1:1 (Selector Bridge) protection,
the other side is 1+1 (Permanent Bridge) protection;
2. Channel type mismatch, one side has APS channel, the other side has no APS channel;
3. Switching type mismatch, one side is bidirectional switching,
the other side is unidirectional switching;
4. Operation type mismatch, one side is revertive operation,
the other side is non-revertive operation;
5. Traffic request mismatch, one side selects working connection,
the other side selects protection connection;